Stress response of <i><scp>S</scp>almo salar</i> (<scp>L</scp>innaeus 1758) facing low abundance infestation of <i><scp>C</scp>aligus rogercresseyi</i> (<scp>B</scp>oxshall &amp; <scp>B</scp>ravo 2000), an object in the tank, and handling

Gómez, Margarita P. González; Arribas, Sandra Lorena Marín; Vargas‐Chacoff, Luis

doi:10.1111/jfd.12419

Cited by 12 publications

(7 citation statements)

References 55 publications

(107 reference statements)

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“…The lactate values observed in this experiment were within the range of values reported for white seabream [55]. The absence of statistical differences in both treatments for lactate levels is not in agreement with the differences observed in other studies with fish parasites [57]. However, there was a tendency for a high level of lactate at 5 h after infestation.…”

Section: Discussioncontrasting

confidence: 68%

Influence of Age on Stress Responses of White Seabream to Amyloodiniosis

Moreira

Cordeiro-Silva

Barata

et al. 2019

Fishes

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Amyloodiniosis is a disease that represents a major bottleneck for semi-intensive aquaculture, especially in Southern Europe. The inefficacy of many of the treatments for this disease on marine fish produced in semi-intensive aquaculture has led to a new welfare approach to amyloodiniosis. There is already some knowledge of several welfare issues that lead to amyloodiniosis as well as the stress, physiological, and immunological responses to the parasite by the host, but no work is available about the influence of fish age on the progression of amyloodiniosis. The objective of this work was to determine if stress, hematological, and histopathological responses are age dependent. For that purpose, we determined the mortality rate, histopathological lesions, hematological indexes, and stress responses (cortisol, glucose, lactate, and total protein) in “Small” (total weight: 50 ± 5.1 g, age: 273 days after eclosion (DAE)) and “Big” (total weight: 101.3 ± 10.4 g, age: 571 DAE) white seabream (Diplodus sargus) subjected to an Amyloodinium ocellatum infestation (8000 dinospores mL−1) during a 24-h period. The results demonstrated a strong stress response to A. ocellatum, with marked differences in histopathological alterations, glucose levels, and some hematological indexes between the fish of the two treatments. This work elucidates the need to take in account the size and age of the fish in the development and establishment of adequate mitigating measures and treatment protocols for amyloodiniosis.

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Section: Discussioncontrasting

confidence: 68%

Influence of Age on Stress Responses of White Seabream to Amyloodiniosis

Moreira

Cordeiro-Silva

Barata

et al. 2019

Fishes

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“…With regards to growth, it was known that sea lice could reduce appetite, food-conversion efficiency and growth in fish 9 , 36 , 37 . Recently, it has been demonstrated that an infection with C. rogercresseyi is energetically demanding for Atlantic salmon, producing stress and disrupting fish physiology 15 , 38 – 40 . The results presented here confirm such effects, showing that SGR of moribund fish was significantly lower in coinfected fish, compared to fish infected only with P. salmonis .…”

Section: Discussionmentioning

confidence: 99%

Coinfection takes its toll: Sea lice override the protective effects of vaccination against a bacterial pathogen in Atlantic salmon

Figueroa

Bustos

Torrealba

et al. 2017

Sci Rep

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Vaccination is considered crucial for disease prevention and fish health in the global salmon farming industry. Nevertheless, some aspects, such as the efficacy of vaccines, can be largely circumvented during natural coinfections. Sea lice are ectoparasitic copepods that can occur with a high prevalence in the field, are frequently found in co-infection with other pathogens, and are highly detrimental to fish health. The aim of this case-control study was to evaluate the interaction between the detrimental effects of coinfection and the protective effects of vaccination in fish. We used the interaction between the sea louse Caligus rogercresseyi, the bacterial pathogen Piscirickettsia salmonis, and their host, the Atlantic salmon Salmo salar, as a study model. Our results showed that coinfection decreased the accumulated survival (AS) and specific growth rate (SGR) of vaccinated fish (AS = 5.2 ± 0.6%; SGR = −0.05 ± 0.39%) compared to a single infection of P. salmonis (AS = 42.7 ± 1.3%; SGR = 0.21 ± 0.22%). Concomitantly, the bacterial load and clinical signs of disease were significantly increased in coinfected fish. Coinfection may explain the reduced efficacy of vaccines in sea cages and highlights the need to test fish vaccines in more diverse conditions rather than with a single infection.

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“…It was recently demonstrated that six adult C. rogercresseyi per fish will alter the fish's physiological response, affecting their primary and secondary responses (e.g., cortisol and glucose levels), as well as their tertiary response (fish weight). These results suggest that C. rogercresseyi infestation is energetically demanding, leading to an acute and chronic stress response and metabolic reorganization and thereby impacting fish welfare (González, Marín, & Vargas‐Chacoff, ).…”

Section: Introductionmentioning

confidence: 99%

Dynamics ofCaligus rogercresseyi(Boxshall & Bravo, 2000) in farmed Atlantic salmon (Salmo salar) in southern Chile: Are we controlling sea lice?

Mancilla‐Schulz

Marín

Molinet

2019

Journal of Fish Diseases

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Caligus rogercresseyi generates the greatest losses in the salmon industry in Chile. The relationship between salmon farming and sea lice is made up of various components: the parasite, host, environment and farming practices, which make it difficult to identify patterns in parasite population dynamics to define prevention and control strategies. The objectives of this study were to analyse and compare the effect of farming, sanitary practices and environmental variables on the abundance of gravid females (GF) and juveniles (JUV) of C. rogercresseyi on Salmo salar in three Salmon Neighborhood Areas (SNAs) in Region 10, south of Chile. Linear mixed-effects models of the negative binomial distribution were used to evaluate the effect of the different explanatory variables on GF and JUV. Productive variables were the key drivers explaining the abundance of GF and JUV. Results suggest that C. rogercresseyi is not controlled and JUV are persistent in the three SNAs, and sanitary practices do not control the dissemination of the parasite among sites. Environmental variables had a low impact on sea lice abundance. There is a need to perform analysis for modelling of parasite population dynamics to improve Integrated Pest Management, including changes in the governance to achieve an effective prevention and control.

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Stress response of Salmo salar (Linnaeus 1758) facing low abundance infestation of Caligus rogercresseyi (Boxshall & Bravo 2000), an object in the tank, and handling

Cited by 12 publications

References 55 publications

Influence of Age on Stress Responses of White Seabream to Amyloodiniosis

Influence of Age on Stress Responses of White Seabream to Amyloodiniosis

Coinfection takes its toll: Sea lice override the protective effects of vaccination against a bacterial pathogen in Atlantic salmon

Dynamics ofCaligus rogercresseyi(Boxshall & Bravo, 2000) in farmed Atlantic salmon (Salmo salar) in southern Chile: Are we controlling sea lice?

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